An all new optical card had to be ordered as to why was my fuses blowing? With quick call around was able to chat with a UK cinema supplier that was helpful. "If fuses start blowing. Unplug all the cards and power the CP200 up again if the LED stay on for +15v -15 +24 then its okay" "next plug the cards back in, one by one. If fuses blows then that is the faulty card." New cat108 optical card. The one that was broken had a missing part in the centre of the part its the x4 round things in the wrapping. Once new card was fitted the fuses stopped blowing as I was running out of quick blow fuses and had to order a new bundle of 1A 2A and 3A.